Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 141
COAL-MINIXG MACHINES. 127 baring a hole If to 2 in. in diameter, a^ may be required. Seven, eight, and nine foot auger-bits are used to good advantage. The Jeffrey Air-Fe^d Brill (Fig. 3) is similar in many respects to the positive-feed drill.In place of the feed-screw it has a feed-lube containing…
Mechanical engineering
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